Minibel tomato-purple ish dot leaf?

hello i have grown the minibel tomato in door in a pot for around one month and it is already flowering but i notice a while ago the bottom leaf of the plant has purple ish dot on the leaf, is it a roblem? should i worry? i have three plant in seperate pot and all three of them has it.

I wouldn't worry about it - doesn't look like a diease. As that leaf is shaded by the ones above anyway, you may as well nip it off. That way, if there is any disease, it will help to stop it spreading.

Hiya 12, indoors do you mean in the house/ conservatory ? I was wondering how they were going to get pollinated. If inside I think you will have to manually pollinate by gently brushing each flower with a bit of cotton wool or a small brush, from one flower to to the next.